WASHINGTON -

South Dakota U.S. Sen. John Thune has been re-elected to serve as the third-ranking Senate Republican.
    
Thune was chosen Wednesday to be the chairman of the Senate Republican Conference, a post he first assumed in 2012.
    
The state's senior senator says the GOP-led Congress will work with President-elect Donald Trump and Democrats on improving Americans' economic security and protecting the country.
    
Thune was easily re-elected last week to a third term in the Senate. He narrowly defeated Democratic leader Tom Daschle in 2004 to take the seat and didn't face an opponent in 2010.